Johannes wants to know whether soil, water, or both are needed for plant growth. he chooses to conduct experiments on a willow tree for five years to answer his question. how can his experimental methods be changed to improve his experiment? a. he needs to ask scientists what they think. b. he needs to conduct the experiment for a longer period. c. he needs to use a larger sample size. d. he needs to test more factors in the environment.

The correct answer is (c) He needs to use a large sample size.

Johannes needs to use a large sample size to get the results more precisely and accurately. The large sample size could have used soil in such a way that the results could have recorded more early. The time of experiment could have reduced. The large sample size could have consumed more amount of soil and water so that the results obtained by them could have been more accurate.

there are mainly three domains in biological classification namely; archaea, bacteria, and eukarya.

archaea includes all the prokaryotic cells which are characterized by their lipid membranes. they have branched hydrocarbon which is attached to glycerol through an ether linkage.

bacteria includes all the prokaryotic cells, the cell membrane of which are made up of the unbranched fatty acid chain. in addition, they are attached to glycerol through an ester bond.

eukarya includes all the eukaryotic cells, that is, the cells contain a nucleus and other membrane-bound cell organelles.

they can be autotrophic as well as heterotrophic, unicellular as well as multicellular

they include kingdoms like protista, plantae, animalia, fungi et cetera.

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explanation:

most community's take hundreds of years to become stable